Limiting the rendering of instances of recursive elements in view output

ABSTRACT

Provided are a computer program product, system, and method for limiting the rendering of instances of recursive elements in view output. A schema provides a definition of elements, wherein at least one of the elements comprises a recursive element of a recursive data type, wherein the recursive data type allows for instances of the recursive element to include instances of that same recursive data type at different levels in a hierarchy. A condition is received for terminating recursion for the recursive element. A view is generated for the schema including information on the condition for terminating the recursion, wherein the processing of the view causes a parser to chunk instances of the recursive element in schema data in response to the condition indicating to terminate recursion at the level of the instance of the recursive element being processed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a computer program product, system, and method for limiting the rendering of instances of recursive elements in view output.

2. Description of the Related Art

An Extensible Markup Language (XML) schema is a description of elements in a document encoded using the XML language. The XML schema may also be used to define a data model, also known as a meta model comprising a definition of a hierarchical representation of nodes that represent the data and relationship of data content for a data model. XML schemas that define more complex data models may have 1000s of nodes arranged in a complex hierarchy of trees of nodes. A large scale schema may be comprised of multiple XML Schema Definition (XSD) files and provides a definition of large scale trees of nodes and data content.

An XML schema may include a recursive data type. An XML schema is said to be recursive when the type definition allows for elements of the same name and type to appear in their own definition. Recursion may be explicit or implicit such that recursive elements defined with the recursive data type will themselves contain other instances of that same type. The presence of recursive types significantly increases the complexity of specifying transformations between XML datasets as well as between XML datasets and datasets with non-hierarchical formats such as relational. The XML schemas which define the structure of XML data represent the recursive data structures via recursive type definitions. Transformations to, from, and between XML datasets are typically specified as mappings to and from the types defined in the XML schemas. Such mappings serve to document the relationships between datasets and also provide the basis for automated transformation tools that convert one dataset into another. But in the presence of recursive types, simple mappings are inherently ambiguous since it can be unclear which, and how many, levels of recursive structure are being mapped.

SUMMARY

Provided are a computer program product, system, and method for limiting the rendering of instances of recursive elements in view output. A schema provides a definition of elements, wherein at least one of the elements comprises a recursive element of a recursive data type, wherein the recursive data type allows for instances of the recursive element to include instances of that same recursive data type at different levels in a hierarchy. A condition is received for terminating recursion for the recursive element. A view is generated for the schema including information on the condition for terminating the recursion, wherein the processing of the view causes a parser to chunk instances of the recursive element in schema data in response to the condition indicating to terminate recursion at the level of the instance of the recursive element being processed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an embodiment of a computing environment.

FIG. 2 illustrates an example of a snippet of schema defining elements.

FIG. 3 illustrates an example of a snippet of generated structured XML elements.

FIGS. 4 and 12 illustrate embodiments of operations to generate a view for a schema.

FIG. 5 illustrates an embodiment of operations to generate a graphical user interface (GUI) to create a view.

FIGS. 6 and 7 illustrate embodiments of a GUI to define elements to include in a view.

FIG. 8 illustrates an embodiment of view node information.

FIG. 9 illustrates an embodiment of operations to parse data for a schema using a view.

FIG. 10 illustrates an embodiment of a GUI to define termination conditions for a recursive element.

FIG. 11 illustrates an embodiment of operations to parse data for a schema.

FIG. 13 illustrates an embodiment of a schema definition to transform recursive structures to non-recursive structures.

FIG. 14 illustrates an embodiment of operations to parse schema data and a view for the schema when the schema definition includes a non-recursive type definition for the previously defined recursive elements.

FIG. 15 illustrates an embodiment of output from parsing the schema according to FIG. 14.

FIG. 16 illustrates an embodiment of computing components.

DETAILED DESCRIPTION

Described embodiments provide techniques to generate a view for a schema to limit a number of levels at which recursive elements are expanded in a view by allowing the view to have instances of recursive elements chunked upon satisfying a condition for terminating recursion to allow the user to control the level at which instances of structured recursive elements are generated into the view output. Further embodiments provide techniques for transforming hierarchical recursive type elements to non-recursive type elements where hierarchical information is encoded in attributes of the non-recursive type elements.

FIG. 1 illustrates an embodiment of a computing environment 100 including a computer with a client web graphical user interface (GUI) 102, an application server 104, a repository 106, and a file system 108. Users access the client GUI 102 to import XSD files 110 from file system 108 and save the XML schema 112 defined by the XSD files 110 to the repository 106. The client GUI 102 invokes the schema import service 114 deployed on the application server 104 to import XSD files 110. A user at the client GUI 102 further invokes the view creation and edit service 116 to create views 118 of an XML schema 112 and save the views 118 to the central repository 106. The client GUI 102 invokes the view creation and edit service 116 deployed on the application server 104 to create and edit views 118.

The user accesses the GUI 102 to invoke an XML parser 120 to parse XML data 122, comprising an implementation of the XML schema 112, according to the view 118 to generate XML view output 124 comprising a defined view of the XML elements from the XM data 122.

The application server 104, client GUI 102, repository 106, and file system 108 may interconnect over a network 126. The components of FIG. 1 may be implemented with suitable computing architectures. In one embodiment, the client GUI 102 may be web based, invoking the services 114, 116, and 120 using SOAP (Simple Object Access Protocol) web services or Hypertext Transport Protocol (HTTP) based Representational State Transfer (REST) services. In one embodiment, the client GUI 102 and the services 114, 116, and 120 may be integrated into one standalone application or distributed in multiple application components. The repository 106 may comprise a relational database or a non-relational database.

The repository 106 and file system 108 may be implemented in storage media in one or more storage devices known in the art, such as interconnected hard disk drives (e.g., configured as a DASD, RAID, JBOD, etc.), solid state storage devices (e.g., EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, solid state disks (SSDs), flash disk, storage-class memory (SCM)), electronic memory, etc. The repository 106 and file system 108 may be implemented in the same or different storage devices. The network 126 may comprise an interconnected network (e.g., Intranet, Internet, Local Area Network (LAN), Storage Area Network (SAN), etc.).

In described embodiments, the schema 112 comprises an XML schema. In alternative embodiments, the schema 112 may be implemented in suitable structured document definition languages other than XML. Further, the XML schema may comprise a text-based meta-language for describing data shared between applications as defined for an industry group.

The views 118, created by the view creation and edit service 116, and stored in the repository 106, include a schema identifying the schema 112 from which the view 118 was generated and nodes corresponding to nodes or elements selected from the schema 112. Each view node in a view 122 has a matching node in the schema 112. The view nodes include information on how to render the nodes from the schema, corresponding to elements in the schema, in the view output 124, i.e., whether to include, chunk or generate structured elements for the instances of the elements corresponding to the view nodes.

FIG. 2 illustrates an embodiment of a snippet of a schema definition 200 having a recursive definition for the recursive element “manages” 206, which has an XML type of EmployeeType 204. The recursive element “manages” 206 defines a relationship that an employee can manage multiple other employees which can have their own recursive element “manages”.

FIG. 3 illustrates XML data 122 having data for the schema definition 200 of FIG. 2, showing an instance of an employee element 302 and then recursive instances of the “manages” element 304 of employees that manage other employees, and so on. Described embodiments concern operations to transform the XML data 122, such as the data 300, into a relational data set or other formats to be stored in a relational or other types of databases.

FIG. 4 illustrates an embodiment of operations performed by the view creation and edit service 116 to generate a view 118 to terminate recursion of structured recursive elements at a certain level. Upon initiating (at block 400) an operation to generate a view 118, a schema 112 is imported (at block 402). The view creation and edit service 116 receives (at block 404) a condition for terminating recursion for a recursive element in the imported XML data 122. A view 118 for the schema including information on the condition for terminating the recursion is generated (at block 406) and the generated view 118 is stored (at block 408) in the repository 106.

FIG. 5 illustrates an embodiment of operations performed by the view creation and edit service 116 to provide a graphical user interface (GUI) to enable a user to select through the GUI the condition for terminating recursion. Upon initiating (at block 500) an operation to generate a GUI for the view creation and edit server 116, such as the GUI 600 shown in FIG. 6 and GUI 700 shown in FIG. 7, the view creation and edit service 116 generates (at block 502) a GUI having a tree representation of nodes for the elements in the XML schema 112, including a user selectable node for each level of the recursive element in the XML schema 112. Each user selectable node enables a user to expand the recursive element at the level associated with the node to have instances of that recursive level at that level included as structured elements in the view output 124 or whether chunking will occur for the recursive elements and all instances having a level below the level of the recursive element selected from the GUI.

For instance, the GUI 600 in FIG. 6 shows a tree representation 602 of the employee elements and “manages” recursive elements in the XML schema 112. FIG. 6 shows user selectable nodes for the employee and manages recursive element that allows the user to selectively unwind that element by clicking the plus sign (“+”) adjacent to the manages element, once the plus sign is selected, the negative sign (“−”) is displayed as shown in FIG. 6 showing that that element has been unwound at that level. When the user selects to “unwind” the “manages” recursive element, all the attributes for that element are shown. By selecting to unwind a node representing a recursive element, the user has selected to include that level of the recursive element as a structured element generated into any view output 124. The user has indicated in the GUI 600 to include five levels of instances of the recursive element because five levels of the manages recursive element are shown as “unwound”. The user has also selected to chunk below the fifth level by not unwinding the text attribute 604 below the fifth instance of the “manages” recursive element 606 to allow expansion beyond the fifth level of the manages recursive element. In this way, the user has selected to chunk below the fifth level of instances of the recursive element. Chunking at a level and all levels beyond that chunked level causes the parser 120 to output the recursive elements as text in a string, and not as structured elements in the schema language, e.g., XML.

FIG. 7 illustrates another embodiment of the GUI 700 having nodes, e.g., 702 ₁, 702 ₂, 703 ₃, 704 ₄, for each level of the manages recursive element in the XML schema 112. The user may select to include instances that level of the recursive element in the view 116 by toggling the arrow graphical element to the left of each of the nodes 702 ₁, 702 ₂, 703 ₃, 704 ₄. A downward pointing arrow graphical element, such as for the nodes 702 ₁, 702 ₂, 703 ₃, indicates that those levels have been expanded to include in the view, by not toggling the arrow for the recursive element 704 ₄, the user has selected to chunk below that fourth level. The user may also indicate to not include a level of a recursive element in the view by selecting the check boxes in the include column 706. If the include box is checked, than instances for that level of the manages recursive element is included in the view output 124, otherwise if unchecked, instances of that level of recursive element are not included in the view output 124. If the level of the instance of the recursive element is included in the view output 124, then the user may select the box in the chunk column 708 to indicate that instances of the recursive element at the corresponding level of the selected chunk box 710, e.g., the manages element 702 ₄ at the fourth level and levels beyond the fourth level are to be chunked.

The user may use command lines to provide instructions for a level of the recursive element at which instances of the recursive element in the XML schema 112 will be chunked. For instance, the user may specify a maximum level up to which instances of the specified recursive element will be generated into the view output 124, such that instances for levels of the recursive element beyond the user specified maximum level are chunked, meaning their data is included in a string as text, not as nested XML structured elements.

FIG. 8 illustrates an embodiment of view node information 800 included in the view 122 being generated based on the level at which the user selected to chunk a particular recursive element, which may be specified through a GUI, such as shown in FIGS. 6 and 7. The view node information 800 for one node includes a view node name 802, such as for a recursive element; a level 804 in the recursive nodes; an include field 806 indicating whether instances of the recursive element corresponding to the view nod 802 are included in the view 118; and a chunk field 808 indicating whether instances of corresponding recursive element at the corresponding level 804 are chunked. If not indicated as chunked, then instances of the recursive element corresponding to the view node 802 are generated as structured XML elements into the view output 124.

FIG. 9 illustrates an embodiment of operations performed by the XML parser 120 to parse the XML data 122, i.e., schema 112 data, according to one of the views 118 having a termination condition for a recursive element to generate view output 124 during parsing runtime. Upon initiating (at block 900) an operation to parse the XML data 122 according to a view 118, the XML parser 120 may process (at block 902) non-recursive elements and attributes and generate them as structured elements, e.g., structured XML data, into the view output 124. Upon processing (at block 904) an instance of a recursive element in the XML data 122, e.g., manages, if (at block 906) a termination condition indicates to not terminate recursion at the level of the processed instance, i.e., chunking was not selected for that level, then the XML parser 120 generates (at block 908) a structured element for the instance into the view output 124. Otherwise, if the level of the processed instance of the recursive element is to be chunked, then the XML parser 120 chunks (at block 910) data for the processed instance and for instances of recursive elements at higher levels of recursion within the instance processed into a string as text. The string data of chunked instances of recursive elements may be logged, included into the view output 122, discarded, etc. From block 908 or 910, if (at block 912) there are further unprocessed instances of the recursive element in the XML data 122, then control proceeds back to block 904 to process that further instance, else, control ends.

In this way, the XML parser 120 will recognize non-nested (top level) instances of the recursive type, parse the contents of those instances, and emit the XML structure corresponding to those instances. Nested instances of the recursive type will also be parsed and emitted as XML structure as long as the user specified recursion level has not been reached. Once the maximum prescribed recursion level has been reached, the parser 120 chunks the nested instances at and below that level, and does not parse the nested instance's components. Instead, the parser 120 emits a string representation of the nested instance (including any additional instances nested within the current one) rather than emitting an XML structure.

In a further embodiment to specify the termination condition, the user may supply via a GUI or command line interface a predicate for each recursive type and that predicate specifies the condition under which instances of the recursive element are chunked or not outputted as structured element instances, XML structures. In one embodiment the predicate may be coded as an annotation in the view schema, e.g., “<xsd:annotation><xsd:appinfo>predicate</xsd:appinfo></xsd:annotation>”. These termination condition annotations may be attached to the type definitions in the view 118 schema definitions so that the predicates can be evaluated at runtime.

When the XML parser 120 recognizes an instance of the recursive type, the parser evaluates the predicate. If the predicate evaluates to true then the parser emits the XML structure corresponding to the instance and continues parsing the instance's components. If the predicate evaluates to false then the parser chunks the instance; it does not parse the instance's components, and the parser emits a string representation of the instance rather than emitting an XML structure.

FIG. 10 illustrates an embodiment of a GUI 1000 in which the user has entered an expression 1002 specifying termination conditions for the “manages” recursive element where the user has created a predicate expression that specifies different levels of the recursive element at which to terminate recursion for different values of an attribute of the recursive element. For instance, if the employee title attribute for an employee managing another employee is “executive”, then recursion is terminated at level four, allowing four recursive levels instances of the recursive element “manages” for executive employees to be generated as structured XML elements, e.g., with tags and markup, into the view output 124. After the fourth level, the instances of the manager recursive element are chunked. The expression 1002 also specifies that if the manager employee is a “second line manager” than there are three levels of instances of the recursive element “manages” generated as structured XML elements. Otherwise, if the type of the employee is not specified, only one level of instances of that type of “manages” are generated as structured elements in the view output 122.

FIG. 11 illustrates an embodiment of operations performed by the XML parser 120 to parse XML data 122 for a view 118 that includes a termination condition comprising a predicate providing specifying termination at different levels of recursion for different attributes of the recursive element, such as shown in the expression 1002 in FIG. 10. Upon initiating (at block 1100) an operation to parse XML data 122 using a view 118 having a predicate indicating different levels of the recursive element at which to terminate recursion for different values of an attribute of the recursive element, the XML parser 120 may process (at block 1102) non-recursive elements and attributes and generate them as structured elements, e.g., structured XML data, into the view output 124. Upon processing (at block 1104) an instance of a recursive element in the XML data 122, e.g., manages, if (at block 1106) the attribute value for the processed instance indicates that the level of the processed instance is not the level at which to terminate recursion, then the XML parser 12 generates (at block 1108) a structured element for the instance in the view output 124. Otherwise, if (at block 1106) the attribute value for the processed instance indicates that recursion should be terminated for the level of the processed instance, then the XML parser 120 chunks (at block 1110) data for the processed instance and for instances of recursive elements at higher levels of recursion within the instance processed into a string as text. From block 1108 or 1110, if (at block 1112) there are further unprocessed instances of the recursive element in the XML data 122, then control proceeds back to block 1104 to process that further instance, else, control ends.

In a further embodiment, the XML parser 120 may be configured to transform hierarchically structured data, such as recursive elements, to a flat, relational dataset where the XML output may be readily transformed to relational data for a relational database.

FIG. 12 illustrates an embodiment of operations performed by the view creation and edit service 116 to augment the XML element definitions in the view 118 schema to allow for the transformation of recursive hierarchical elements to flat, non-hierarchical data, when parsing the XML data 112. Upon initiating (at block 1200) an operation to generate a view 118, the schema 112 is imported (at block 1202). The view creation and edit service 116 receives (at block 1204) user input parse recursive types as non-recursive structures for the recursive element defined in the schema. The view creation and edit service 116 augments (at block 1206) the definition of the recursive element in the view 118 schema to include a first attribute for the unique identifier of the element and a second attribute for the parent unique identifier. The generated view 118 is then stored (at block 1208)

FIG. 13 illustrates an example of how the schema 112 having the definition of the manages recursive EmployeeType definition shown in FIG. 2 may be augmented in the definition 1300 in the view 118 to include as attributes a unique ID 1302 and parent ID 1304 having the unique ID of the parent to the recursive element. Further, the definition 1300 does not include a recursive definition such as shown in FIG. 2 for the EmployeeType having an unbounded 208 number of occurrences. In this way, the element definition of the recursive element in the view 118 schema is flattened, and hierarchical information is encoded in the parent ID 1302 attribute indicating a hierarchical parent to an EmployeeType instance.

FIG. 14 illustrates an embodiment of operations performed by the XML parser 120 to process XML data 122 and a view including the augmented schema definition, such as shown in FIG. 13. Upon initiating (at block 1400) an operation to parse based on a view 118 having a schema definition including the non-recursive type definition with XML data having instances of the recursive element, the XML parser 120 sets (at block 1402) a variable i to 1, which is used to determine the unique ID 1302 for the recursive element. Upon processing (at block 1404) an instance of the recursive element in the XML data 122, the XML parser 120 generates (at block 1406) a structured element XML statement for the element having an ID attribute 1302 set to i. If (at block 1408) the processed instance is not a child to a parent instance of the recursive element, i.e., at a lower level in the hierarchy of the recursive element instances, then the attribute for the parent ID 1304 is set (at block 1410) to indicate no parent. Otherwise, if there is a parent instance of the processed instance of the recursive element, then the parent ID attribute 1304 is set (at block 1412) to the ID attribute value 1302 of the parent instance, for which a structured element statement would have been generated. If (at block 1414) there are further instances of the recursive element to process, control proceeds back to block 1404, else control ends.

With the operations of FIG. 14, the presence of the ID 1302 and parentID 1304 attribute values effectively encodes the hierarchical relationships within the data, without requiring those relationships to be explicitly reflected in the XML structures.

FIG. 15 illustrates an example of the non-hierarchical view output 124, where the element definition statements are non-hierarchical, with hierarchical relationship information reflected in the ID and parent ID attribute values.

The described embodiments provide techniques to terminate the number of levels at which instances of recursive elements are generated into view output to allow the user to tailor the schema view output for easier viewing. Further, with described embodiments, the user may create a view with a modified schema definition for recursive elements that transforms an element having a recursive type into a non-recursive type element with hierarchical information encoded in attributes of the structured element generated into the view output.

The described embodiments allow the user to tailor the display and rendering of instances of recursive elements in view output to optimize the viewing options for the user.

The described operations may be implemented as a method, apparatus or computer program product using standard programming and/or engineering techniques to produce software, firmware, hardware, or any combination thereof. Accordingly, aspects of the embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the embodiments may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon.

Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).

Aspects of the present invention are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

The terms “an embodiment”, “embodiment”, “embodiments”, “the embodiment”, “the embodiments”, “one or more embodiments”, “some embodiments”, and “one embodiment” mean “one or more (but not all) embodiments of the present invention(s)” unless expressly specified otherwise.

The terms “including”, “comprising”, “having” and variations thereof mean “including but not limited to”, unless expressly specified otherwise.

The enumerated listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise.

The terms “a”, “an” and “the” mean “one or more”, unless expressly specified otherwise.

Devices that are in communication with each other need not be in continuous communication with each other, unless expressly specified otherwise. In addition, devices that are in communication with each other may communicate directly or indirectly through one or more intermediaries.

A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary a variety of optional components are described to illustrate the wide variety of possible embodiments of the present invention.

Further, although process steps, method steps, algorithms or the like may be described in a sequential order, such processes, methods and algorithms may be configured to work in alternate orders. In other words, any sequence or order of steps that may be described does not necessarily indicate a requirement that the steps be performed in that order. The steps of processes described herein may be performed in any order practical. Further, some steps may be performed simultaneously.

When a single device or article is described herein, it will be readily apparent that more than one device/article (whether or not they cooperate) may be used in place of a single device/article. Similarly, where more than one device or article is described herein (whether or not they cooperate), it will be readily apparent that a single device/article may be used in place of the more than one device or article or a different number of devices/articles may be used instead of the shown number of devices or programs. The functionality and/or the features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of the present invention need not include the device itself.

The illustrated operations of the figures show certain events occurring in a certain order. In alternative embodiments, certain operations may be performed in a different order, modified or removed. Moreover, steps may be added to the above described logic and still conform to the described embodiments. Further, operations described herein may occur sequentially or certain operations may be processed in parallel. Yet further, operations may be performed by a single processing unit or by distributed processing units.

The elements of the computing environment of FIG. 1, including the client GUI 102, application server 104 and components 114, 116, 120, repository 106, and file system 108 may be implemented in one or more computer systems, such as the computer system 1602 shown in FIG. 16. Computer system/server 1602 may be described in the general context of computer system executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, and so on that perform particular tasks or implement particular abstract data types. Computer system/server 1602 may be practiced in distributed cloud computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computer system storage media including memory storage devices.

As shown in FIG. 16, the computer system/server 1602 is shown in the form of a general-purpose computing device. The components of computer system/server 1602 may include, but are not limited to, one or more processors or processing units 1604, a system memory 1606, and a bus 1608 that couples various system components including system memory 1606 to processor 1604. Bus 1608 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, Enhanced ISA (EISA) bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnects (PCI) bus.

Computer system/server 1602 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer system/server 1602, and it includes both volatile and non-volatile media, removable and non-removable media.

System memory 1606 can include computer system readable media in the form of volatile memory, such as random access memory (RAM) 1610 and/or cache memory 1612. Computer system/server 1602 may further include other removable/non-removable, volatile/non-volatile computer system storage media. By way of example only, storage system 1613 can be provided for reading from and writing to a non-removable, non-volatile magnetic media (not shown and typically called a “hard drive”). Although not shown, a magnetic disk drive for reading from and writing to a removable, non-volatile magnetic disk (e.g., a “floppy disk”), and an optical disk drive for reading from or writing to a removable, non-volatile optical disk such as a CD-ROM, DVD-ROM or other optical media can be provided. In such instances, each can be connected to bus 1608 by one or more data media interfaces. As will be further depicted and described below, memory 1606 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.

Program/utility 1614, having a set (at least one) of program modules 1616, may be stored in memory 1606 by way of example, and not limitation, as well as an operating system, one or more application programs, other program modules, and program data. Each of the operating system, one or more application programs, other program modules, and program data or some combination thereof, may include an implementation of a networking environment. The components of the computer 2 may be implemented as program modules 1616 which generally carry out the functions and/or methodologies of embodiments of the invention as described herein. The components 18, 24, 28, 48, and 50 of the computing environment 1 may be implemented in one or more computer systems 1602, where if they are implemented in multiple computer systems 1602, then the computer systems may communicate over a network.

Computer system/server 1602 may also communicate with one or more external devices 1618 such as a keyboard, a pointing device, a display 1620, etc.; one or more devices that enable a user to interact with computer system/server 12; and/or any devices (e.g., network card, modem, etc.) that enable computer system/server 1602 to communicate with one or more other computing devices. Such communication can occur via Input/Output (I/O) interfaces 1622. Still yet, computer system/server 1602 can communicate with one or more networks such as a local area network (LAN), a general wide area network (WAN), and/or a public network (e.g., the Internet) via network adapter 1624. As depicted, network adapter 1624 communicates with the other components of computer system/server 1602 via bus 1608. It should be understood that although not shown, other hardware and/or software components could be used in conjunction with computer system/server 1602. Examples, include, but are not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc.

The foregoing description of various embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto. The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims herein after appended. 

What is claimed is:
 1. A computer program product for processing schemas and data in a storage system, wherein the computer program product comprises a computer readable storage medium having computer readable program code embodied therein that executes to perform operations, the operations comprising: providing a schema, wherein the schema provides a definition of elements, wherein at least one of the elements comprises a recursive element of a recursive data type, wherein the recursive data type allows for instances of the recursive element to include instances of that same recursive data type at different levels in a hierarchy; receiving a condition for terminating recursion for the recursive element; and generating a view for the schema including information on the condition for terminating the recursion, wherein processing of the view causes a parser to generate a structured element for a processed instance of a recursive element in view output if the recursive element does not satisfy the condition for terminating the condition and to chunk data for the processed instance of the recursive element to generate in the view output in response to the condition indicating to terminate recursion at the level of the instance of the recursive element being processed.
 2. The computer program product of claim 1, wherein the processing of the view further causes the parser to generate levels of instances of the recursive element as structured elements in the view output when the condition indicates to not terminate recursion at the levels of the instances of the recursive element being processed.
 3. The computer program product of claim 1, wherein the receiving the condition comprises receiving indication of a maximum recursive level, wherein the condition causes the generating of the instances of the recursive element as structured elements in the view output up to the maximum recursive level and chunk data for the instances of the recursive element at levels beyond the maximum recursive level.
 4. The computer program product of claim 1, wherein the chunking of the data for the processed instances of the recursive element comprises generating a string including information on instances of the recursive element at levels beyond a maximum level.
 5. The computer program product of claim 1, wherein the operations further comprise: generating a graphical user interface (GUI) having a tree representation of the schema data including a user selectable node for each level of the recursive element included in the schema, wherein each user selectable node enables a user to indicate the level of the recursive elements at which chunking will occur, wherein the received condition comprises the indicated level in the GUI at which chunking will occur.
 6. The computer program product of claim 5, wherein the user selectable nodes for the levels of the recursive element has a graphical indicator that enables the user to expand a further node for a further level of the recursive element to include in the view output as structured elements and to a second value to indicate to chunk in the view instances of the recursive element at levels beyond the further level the user selected to expand.
 7. The computer program product of claim 6, wherein the graphical indicator to expand a further level of the recursive element comprises a first graphical indicator, wherein generating the GUI comprises: generating a second graphical element next to each node of the recursive element expanded in the GUI enabling the user to indicate whether to chunk instances of the recursive element at the level at which chunking is indicated and for levels beyond the level at which chunking is indicated; and generating a third graphical element next to each level of the recursive element in the schema enabling the user to indicate whether to include instances of the recursive element at the level in the view.
 8. The computer program product of claim 1, wherein the received condition comprises a definition of a predicate specifying a condition for terminating recursion for the recursive element, wherein the operations further comprise: generating an annotation to include in a schema definition of the recursive element in the view to encode the received definition of the predicate.
 9. The computer program product of claim 1, wherein the received condition comprises a predicate specifying one of a plurality of values for an attribute, wherein the values for the attribute indicate different levels of the recursive element at which to terminate recursion.
 10. The computer program product of claim 9, wherein for the processed instance of the recursive element, if an attribute value for the processed instance indicates that the level of the processed instance is not the level at which to terminate recursion, then the instance of the recursive element is generated as the structured element in the view output, and if the attribute value for the processed instance indicates that the level of the processed instance is at the level at which to terminate recursion, then the processed instance of the recursive element and all instances of recursive elements at levels below the level of the processed instance are chunked and string representation of the recursive element and its child nodes are returned.
 11. A system for processing schemas and data in a storage system, comprising: a processor; and a computer readable storage medium including program code executed by the processor to perform operations, the operations comprising: providing a schema, wherein the schema provides a definition of elements, wherein at least one of the elements comprises a recursive element of a recursive data type, wherein the recursive data type allows for instances of the recursive element to include instances of that same recursive data type at different levels in a hierarchy; receiving a condition for terminating recursion for the recursive element; and generating a view for the schema including information on the condition for terminating the recursion, wherein processing of the view causes a parser to generate a structured element for a processed instance of a recursive element in view output if the recursive element does not satisfy the condition for terminating the condition and to chunk data for the processed instance of the recursive element to generate in the view output in response to the condition indicating to terminate recursion at the level of the instance of the recursive element being processed.
 12. The system of claim 11, wherein the processing of the view further causes the parser to generate levels of instances of the recursive element as structured elements in view output when the condition indicates to not terminate recursion at the levels of the instances of the recursive element being processed.
 13. The system of claim 11, wherein the receiving the condition comprises receiving indication of a maximum recursive level, wherein the condition causes the generating of the instances of the recursive element as structured elements in the view output up to the maximum recursive level and chunk data for the instances of the recursive element at levels beyond the maximum recursive level.
 14. The system of claim 11, wherein the operations further comprise: generating a graphical user interface (GUI) having a tree representation of the schema including a user selectable node for each level of the recursive element included in the schema, wherein each user selectable node enables a user to indicate the level of the recursive elements at which chunking will occur, wherein the received condition comprises the indicated level in the GUI at which chunking will occur.
 15. The system of claim 14, wherein the user selectable nodes for the levels of the recursive element has a graphical indicator that enables the user to expand a further node for a further level of the recursive element to include in the view output as structured elements and to a second value to indicate to chunk in the view instances of the recursive element at levels beyond the further level the user selected to expand.
 16. The system of claim 15, wherein the graphical indicator to expand a further level of the recursive element comprises a first graphical indicator, wherein generating the GUI comprises: generating a second graphical element next to each node of the recursive element expanded in the GUI enabling the user to indicate whether to chunk instances of the recursive element at the level at which chunking is indicated and for levels beyond the level at which chunking is indicated; and generating a third graphical element next to each level of the recursive element in the schema enabling the user to indicate whether to include instances of the recursive element at the level in the view.
 17. The system of claim 11, wherein the chunking of the data for the processed instance of the recursive element comprises generating a string including information on instances of the recursive element at levels beyond a maximum level.
 18. The system of claim 11, wherein the received condition comprises a definition of a predicate specifying a condition for terminating recursion for the recursive element, wherein the operations further comprise: generating an annotation to include in a schema definition of the recursive element in the view to encode the received definition of the predicate.
 19. The system of claim 11, wherein the received condition comprises a predicate specifying one of a plurality of values for an attribute, wherein the values for the attribute indicate different levels of the recursive element at which to terminate recursion.
 20. The system of claim 19, wherein for the processed instance of the recursive element, if an attribute value for the processed instance indicates that the level of the processed instance is not the level at which to terminate recursion, then the instance of the recursive element is generated as the structured element in the view output, and if the attribute value for the processed instance indicates that the level of the processed instance is at the level at which to terminate recursion, then the processed instance of the recursive element and all instances of recursive elements at levels below the level of the processed instance are chunked and string representation of the recursive element and its child nodes are returned. 